The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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joule-atomic mass unit relationship
 $(1 {\rm \ J})/c^2$
 Numerical value  6.700 535 2471 x 109 u
 Standard uncertainty  0.000 000 0021 x 109 u
  Relative standard uncertainty  3.1 x 10-10
 Concise form  6.700 535 2471(21) x 109 u    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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